# HG changeset patch
# User Anton Shestakov <av6@dwimlabs.net>
# Date 1621018684 -28800
# Node ID e682bbe66e37eca245794e64f583818374d51b84
# Parent  51ee9809d90d13c3d4c48ad45841d2c9149b70fb
compat: add check_at_most_one_arg() and check_incompatible_arguments()

diff -r 51ee9809d90d -r e682bbe66e37 hgext3rd/evolve/compat.py
--- a/hgext3rd/evolve/compat.py	Sun May 09 20:02:01 2021 +0800
+++ b/hgext3rd/evolve/compat.py	Sat May 15 02:58:04 2021 +0800
@@ -8,14 +8,17 @@
 
 import contextlib
 
+from mercurial.i18n import _
 from mercurial import (
     cmdutil,
     context,
     copies,
+    error,
     hg,
     logcmdutil,
     merge as mergemod,
     obsolete,
+    pycompat,
     registrar,
     repair,
     scmutil,
@@ -432,3 +435,35 @@
     def format_changeset_summary_fn(ui, repo, command, default_spec):
         return logcmdutil.changesetdisplayer(ui, repo,
                                              {b'template': default_spec}).show
+
+if util.safehasattr(cmdutil, 'check_at_most_one_arg'):
+    def check_at_most_one_arg(opts, *args):
+        return cmdutil.check_at_most_one_arg(opts, *args)
+else:
+    # hg <= 5.2 (d587937600be)
+    def check_at_most_one_arg(opts, *args):
+        def to_display(name):
+            return pycompat.sysbytes(name).replace(b'_', b'-')
+
+        if util.safehasattr(error, 'InputError'):
+            err = error.InputError
+        else:
+            # hg <= 5.6 (8d72e29ad1e0)
+            err = error.Abort
+        previous = None
+        for x in args:
+            if opts.get(x):
+                if previous:
+                    raise err(_(b'cannot specify both --%s and --%s')
+                              % (to_display(previous), to_display(x)))
+                previous = x
+        return previous
+
+if util.safehasattr(cmdutil, 'check_incompatible_arguments'):
+    def check_incompatible_arguments(opts, first, others):
+        return cmdutil.check_incompatible_arguments(opts, first, others)
+else:
+    # hg <= 5.2 (023ad45e2fd2)
+    def check_incompatible_arguments(opts, first, others):
+        for other in others:
+            check_at_most_one_arg(opts, first, other)